* What is the NIP?
@ 1999-08-15 0:18 Brian K. Neidig
1999-08-15 1:32 ` David A. Gatwood
0 siblings, 1 reply; 2+ messages in thread
From: Brian K. Neidig @ 1999-08-15 0:18 UTC (permalink / raw)
To: linuxppc-dev
I've looked throughout the code for a comment describing this, but
couldn't find it. What is the purpose of the NIP? I think it is NOT
QUITE the IP, but I don't know what it is supposed to be. In one place
I saw the NIP being set to the instruction before a branch instruction,
but other things seem to be happening with this variable.
Does it stand for anything? If I knew that, all may become clearer!
For example, is it New Instruction Pointer? Or what?
Brian
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* Re: What is the NIP?
1999-08-15 0:18 What is the NIP? Brian K. Neidig
@ 1999-08-15 1:32 ` David A. Gatwood
0 siblings, 0 replies; 2+ messages in thread
From: David A. Gatwood @ 1999-08-15 1:32 UTC (permalink / raw)
To: Brian K. Neidig; +Cc: linuxppc-dev
On Sat, 14 Aug 1999, Brian K. Neidig wrote:
> I've looked throughout the code for a comment describing this, but
> couldn't find it. What is the purpose of the NIP? I think it is NOT
> QUITE the IP, but I don't know what it is supposed to be. In one place
> I saw the NIP being set to the instruction before a branch instruction,
> but other things seem to be happening with this variable.
AFAIK, it's "next instruction pointer". IOW, it points to whatever
instruction is supposed to be looked at by the processor next. A branch
would thus change this, as I assume an interrupt would, but I'm not 100%
positive about that.
David
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